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Discussion Starter · #1 ·
Hi. I have a BMW 318i E90. The timing was out so recently it’s had a new timing chain put it. Prior to that I had various misfire issues where I had plugs, coils, injectors changed. After this recent timing chain change the rough idling is at the worst it’s been. I have scanned the car and I am getting the following codes:

OBD 2:
P0012 - ‘A’ Camshaft position - Timing over retarded bank 1
P0171 - System too lean bank 1

Engine:
2E8E - Intelligent battery sensor
2A82 - Variable camshaft timing (VANOS) inlet, mechanism
29D0 - Misfire cylinder 4
2A2B

Before the timing chain replacement I was getting mainly misfire codes and spent lots of money and time getting that sorted. I took it to the dealers who diagnosed it and said the timing was off. I got the timing chain done by an independent. Driving wise the car seems better now with the new timing chain but the rough idle which I’ve always experienced has gone even worse. Any idea on what I can do here? The idling was bad after the chain replacement but has gone worse after I fuelled up my tank. Can hear some clicking noises too. Any help would be highly appreciated as I’ve already spent a lot on this car and what to see what I can do myself at home before I take it to the garage. Thank you.
 

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I'd check the battery connections, especially that the IBS (small blue connector) is fitted .. (Seen elsewhere!)
 

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Discussion Starter · #3 ·
I'd check the battery connections, especially that the IBS (small blue connector) is fitted .. (Seen elsewhere!)
Hi. Thanks for the response. I do have a battery sensor code. So you’re saying if it’s not connected it has a link to the rough idling? Nothing to do with Vanos solenoids? I was planning on taking them out and giving them a clean
 

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Not necessarily, but that's the easiest/cheapest thing to look at and will rule it out. Most BMW's, I've found, will have 'issues' if the battery is low on power, has something wrong with it or doesn't have its usual share of connections. ;)

After that, clear all codes and try again.
 
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